Design And Implementation Of Provincial D,E Class GNSS Dense Control Network

With the Global Navigation Satellite System(GNSS)are widely used,the use of GNSS control network has become one of the main methods to control the surveying and mapping project.Because within the provincial domain provided by the A,B class,the actual number and distribution of control point can not meet the needs of the actual surveying and mapping work,for analysis of the provincial domain D,E class dense control measureing is important for practical work.This paper takes Henan D,E class GNSS dense control network as an example.It analyzes the basic theory and method of GNSS control measureing,designed the layout and observation scheme of D,E class GNSS dense control network,designed the data processing program,and carried on the useful exploration of point observation model basing on CORS.In this paper,the main contents of the provincial domain D,E grade GNSS dense control measureing are as follows:1.It given the Henan provincial D,E class GNSS dense control network's technology design,and the provincial domain D,E class GNSS Control Network dense layout scheme.2.It designed the data processing program of D,E class GNSS dense control network,realized the control network's unconstrained adjustment and constrained adjustment.It designed the coordinate conversion scheme of control network,realized the control results' s conversion from CGCS 2000 to XAS80 system.3.Using the Henan province local quasi-geoid model,it obtained D,E network's normal height and the results compared to GNSS elevation fitting results,the results meet the requirement of accuracy.4.We studied the point observation mode of E-class GNSS network control basing on CORS.Through the comparison of two experimental areas show that the mode can meet the need of the task,and can replace the commonly used synchronous graphics mode.